Interfacial Tension of 3hyphen;Methylpentanendash;Nitroethane near the Critical Point

摘要

Experimental data are reported for the capillary rise of the interface between the two liquid phases of 3hyphen;methylpentanendash;nitroethane as a function of temperature. The data are interpreted in terms of a power law currently proposed for the behavior of the interfacial tension near the critical mixing point. The results seem to indicate that for 3hyphen;methylpentanendash;nitroethane the region of asymptotic behavior is limited to rather small values ofDgr;T*thinsp;equals;thinsp;lpar;Tcthinsp;minus;thinsp;Trpar;thinsp;sol;thinsp;Tc. ForDgr;T*thinsp;ge;thinsp;10minus;2Sugden's parametera2can be represented by a power lawa2thinsp;equals;thinsp;A2Dgr;T*phgr;with an exponentphgr;thinsp;equals;thinsp;1.00thinsp;plusmn;thinsp;0.01. A comparison is made with the behavior of the surface tension of simple onehyphen;component liquids near the gasndash;liquid critical point.